摘要
运用三维非静力大气动力学数值模式 ,模拟了稳定、中性和不稳定 3种层结下山区盆地的大气湍流和污染扩散特征 .通过模拟认为 ,在山区复杂地形条件下 ,由风切变引起的机械湍流是湍流运动的主要形式之一 ,它主要受风速的影响 .同时 ,在非中性层结下 ,热力湍流也是湍流运动的主要形式之一 .由于地形复杂和层结变化 ,使得污染扩散与平原地区有较大差异 ,在稳定层结条件下可以产生高浓度的污染 .
A 3\|D nonhydrostatic model with E\|ε closure has been used to simulate the TKE structure and diffusion over mountain area under different stratifications.From the simulation,the vertical motion of air can be affected by statification,but the effect is less than that of teerain.It has been recongnized from the simulation that the shear energy production of TKE is important in turbulent motion under any stra.tification.The theomodynamic production of TKE is also important under nonneutral stratification.The shear production and the absolute value of the thermodynamic production under stable stratification are less than that of unstable stratification about 10 times.The maximum values of the shear and thermondynamic production items appear just on the ground,then they decrease with height just like line.The concentration of pollutant is the maximum under stable stratification and is the minimum under unstable stratification.
出处
《环境科学学报》
CAS
CSCD
北大核心
2000年第5期554-557,共4页
Acta Scientiae Circumstantiae
基金
云南省自然科学基金! ( 98D0 0 2 0M )资助项目
云南省教委科研基金! ( 991 1 1 2 1 )资助项目
